Exercise device



FIG. 1 is a perspective view of the exercise device of the present invention;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof.

The tread pattern and LCD screen are shown in broken line for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an exercise device, as shown and described. 